Symeon 29 was a monk; addressee of two letters from Theodoros 15 (Theodore the Stoudite) written between 815 and 826: Theod. Stud., Ep. 332, pp. 472-473 (addressed Συμεὼν μονάζοντι); 534, p. 807. He is referred to in one other letter, as having sent a number of queries to Theodoros: Theod. Stud., Ep. 487, p. 718, line 41 (a. 821/826; ὃν ἀδελφὸς ἡμῶν Συμεὼν). A supporter of icons; he had an encounter with Ioannes Grammatikos (perhaps Ioannes 5) and opposed his views; with other monks he was persecuted and fled; he is styled τῆς ἁγιωσύνης σου (p. 472, line 2): Theod. Stud., Ep. 332, pp. 472-473. He probably belonged to the monastery of which the hegoumenos was Stephanos 137: Theod. Stud., Ep. 487.

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